From owner-freebsd-questions  Sat May 23 09:35:07 1998
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Date: Sat, 23 May 1998 19:34:35 +0300
From: Garry Paul Cramins <gc9773@batelco.com.bh>
Organization: U.S. Navy
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Subject: Troubleshooting tty-level buffer overflow
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To whom it may concern,

       I am currently running FreeBSD 2.2.5, having decided to give it a
try
 after using linux for about a year now and have run across a problem
 which despite days (literally) at the screen and an endless search of
 the net I have not been able to solve.  While running ppp I get the
 following message: "sio2: tty-level buffer overflow", according to the
 manpage, sio(4), this message is in the application (ie, ppp).  I also
get
 this message with my HP2934A serial printer which prints properly so
 I assume the two serial problems are related.  I am running a Cirrus
Logic
 V.34bis modem with a tyan motherboard (1564 dual pentium, 16550A
 UART's) and this even occurs booting the generic kernel so I assume I
 missed something fairly trivial during setup.  I set the link speed at
 115,200 bps in my ppp.conf file and everything loads fairly quickly on
 my browser, if I set it to 28800 (my modem speed), though, my system
 slows to a crawl and stty on the port lists 9600 as being the speed
With
 the link speed set at 115,200 bps I will get the overflow and
eventually my
 link will slow to a crawl (after approx. 20-25 minutes).  In over a
year
 and a half of running linux and for the last month or so with BSD I
have
 not had any trouble with the operating system and never encountered a
 problem I could not fix but I am stumped.  I contacted Walnut Creek
CD-ROM
 and they thought it might be some sort of hardware problem.  Would
upgrading
 to the 2.2.6 kernel fix this?
       Any input would be greatly appreciated.

                       Garry Cramins
                       gc9773@batelco.com.bh


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